Synthesis and structural characterization of new rhodium formato complexes containing [Rh2]4+ and [Rh4]6+ cores

Crystal structure of tetrakis(µ2-formiato-κ2O:O')bis(4-methylpyridine-κN) dirhodium(II) (Rh–Rh), C16H18N2O8Rh2

“…The other H atoms were positioned geometrically (d(C-H) = 0.93 Å), and refined as riding with U iso (H) = 1.2 U eq (C). (5) Å), and almost equivalent to that in Rh 2 (OOCCH 3 ) 4 (4-pyridinemethanol) 2 (2.4030(7) Å) [9][10][11]. The range of Rh-O distances ranges from 2.029(4) to 2.045(4) Å and the Rh-N distance is 2.241(4) Å, agreeing well with the data of rhodium(II) carboxylates [1,[8][9][10][11].…”

“…Each Rh atom is bound to four O atoms of the formiate ligands in the equatorial coordination plane, while the other two sites on the metal are occupied by one N atom of the 4-methylpyridine ligand and the second rhodium atom. The Rh-Rh bond length is 2.4044(9) Å, which is slightly longer than that found in adducts of dirhodium tetraformiate Rh 2 (OOCH) 4 (H 2 O) 2 (2.38 Å) and Rh 2 (OOCH) 4 (DMF) 2 (2.3973(5) Å), and almost equivalent to that in Rh 2 (OOCCH 3 ) 4 (4-pyridinemethanol) 2 (2.4030(7) Å) [9][10][11]. The range of Rh-O distances ranges from 2.029(4) to 2.045(4) Å and the Rh-N distance is 2.241(4) Å, agreeing well with the data of rhodium(II) carboxylates [1,[8][9][10][11].…”

“…(5) Å), and almost equivalent to that in Rh 2 (OOCCH 3 ) 4 (4-pyridinemethanol) 2 (2.4030(7) Å) [9][10][11]. The range of Rh-O distances ranges from 2.029(4) to 2.045(4) Å and the Rh-N distance is 2.241(4) Å, agreeing well with the data of rhodium(II) carboxylates [1,[8][9][10][11]. The Rh-Rh-O angles have a mean value of 89.9(7)°, individual angles being in the range 89.4(2) to 90.4(2)°.…”

“…Rhodium(II) carboxylates readily form adducts in which the axial sites are occupied by donor solvents or ligands, leading to the isolation of a large number of adducts. Compared to many adducts of dirhodium tetraacetate, however, crystal structures of dirhodium tetraformiate and its adducts are seldom reported [1,8,9]. The title complex crystallized in the form of purple prism crystals of monoclinic symmetry.…”

Synthesis and Structural and Physicochemical Characterization of {[Rh2(μ‐OOCCH3)2(dmbpy)2][BF4]}n Molecular Wire

“…[7,9,26] In the acetate complex with the phen ligand, the dinuclear units [Rh 2 (µ-OOCR) 2 (phen) 2 ] + are associated into tetranuclear moieties, which in turn form infinite RhRh wires with Rh-Rh bond lengths of 2.562, 2.739 and 2.832 Å. [7][8][9] Recently, electrochemical synthesis of {[Rh 2 (µ-OOCCH 3 ) 2 (phen) 2 ] n [BF 4 ] 2 } n was also performed, and its electrochemical and physicochemical properties were inves- tigated. [10] It was demonstrated that the compound obtained chemically is similar to that prepared electrochemically.…”